DISEASE CHARACTERISTICS: Histologically confirmed recurrent metastatic adenocarcinoma of the stomach or gastroesophageal junction No squamous cell or sarcomatous elements in tumor Previously treated with 1 prior fluoropyrimidine and/or platinum based chemotherapy regimen for metastatic disease OR Recurrent disease within 6 months of completing adjuvant fluoropyrimidine-containing therapy Bidimensionally measurable disease No known brain metastases